Dual Alpine Type R R‑W12D4 12" SUV / Hatchback Ported Subwoofer Box Plans Subwoofer Box Plans for Alpine Type R R‑W12D4 12" – Dual Ported Enclosure Build a powerful, clean‑sounding ported enclosure for two Alpine Type R R‑W12D4 12" subwoofers with these precision‑engineered SUV/Hatchback‑optimized subwoofer box plans. Designed for strong low‑end extension and excellent cabin gain, this enclosure delivers deep bass, tight response, and reliable daily performance from Alpine’s legendary Type R series.

Save Money — Build It Yourself Stop wasting materials and guessing on dimensions. These DIY subwoofer box plans make it simple to build a professional‑grade enclosure at home, perfect for anyone wanting big bass without paying custom‑shop prices.

What’s Included - Downloadable ZIP file - Multiple 3D rendering images - Detailed spec sheet with subwoofer & enclosure specs - Professional optimized cut sheet with parts list - Precision‑designed ported enclosure layout

Designed For Dual Alpine Type R R‑W12D4 12" Subwoofers – SUV/Hatchback Application - Woofer Type: (2) Alpine Type R R‑W12D4 - Woofer Size: 12" - Outside Dimensions: 14"H × 32"W × 24"D - Tuning: 33Hz - Performance Notes: Optimized for SUV/Hatchback cabin gain, delivering deep lows, clean output, and strong daily performance May work for other 12" woofers — user discretion advised.

Why These Plans Perform - Optimized specifically for dual Alpine Type R R‑W12D4 12" subs - Designed for deep, accurate bass with strong low‑frequency extension - SUV/Hatchback‑tuned for maximum cabin gain and output - Smooth, predictable response thanks to proper port tuning - Ideal for daily setups needing clean, reliable performance - Eliminates trial‑and‑error and wasted materials